From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: sean.j.christopherson@intel.com, vkuznets@redhat.com
Subject: [PATCH 3/5] KVM: x86: remove now unneeded hugepage gfn adjustment
Date: Thu, 4 Jul 2019 11:32:54 +0200 [thread overview]
Message-ID: <20190704093256.12989-4-pbonzini@redhat.com> (raw)
In-Reply-To: <20190704093256.12989-1-pbonzini@redhat.com>
After the previous patch, the low bits of the gfn are masked in
both FNAME(fetch) and __direct_map, so we do not need to clear them
in transparent_hugepage_adjust.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/mmu.c | 9 +++------
arch/x86/kvm/paging_tmpl.h | 2 +-
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index af9dafa54f85..084c1a0d9f98 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3240,11 +3240,10 @@ static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, kvm_pfn_t pfn)
}
static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
- gfn_t *gfnp, kvm_pfn_t *pfnp,
+ gfn_t gfn, kvm_pfn_t *pfnp,
int *levelp)
{
kvm_pfn_t pfn = *pfnp;
- gfn_t gfn = *gfnp;
int level = *levelp;
/*
@@ -3271,8 +3270,6 @@ static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
mask = KVM_PAGES_PER_HPAGE(level) - 1;
VM_BUG_ON((gfn & mask) != (pfn & mask));
if (pfn & mask) {
- gfn &= ~mask;
- *gfnp = gfn;
kvm_release_pfn_clean(pfn);
pfn &= ~mask;
kvm_get_pfn(pfn);
@@ -3536,7 +3533,7 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code,
if (make_mmu_pages_available(vcpu) < 0)
goto out_unlock;
if (likely(!force_pt_level))
- transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
+ transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
r = __direct_map(vcpu, v, write, map_writable, level, pfn, prefault);
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
@@ -4162,7 +4159,7 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code,
if (make_mmu_pages_available(vcpu) < 0)
goto out_unlock;
if (likely(!force_pt_level))
- transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
+ transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
r = __direct_map(vcpu, gpa, write, map_writable, level, pfn, prefault);
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index bfd89966832b..f39b381a8b88 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -850,7 +850,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
if (make_mmu_pages_available(vcpu) < 0)
goto out_unlock;
if (!force_pt_level)
- transparent_hugepage_adjust(vcpu, &walker.gfn, &pfn, &level);
+ transparent_hugepage_adjust(vcpu, walker.gfn, &pfn, &level);
r = FNAME(fetch)(vcpu, addr, &walker, write_fault,
level, pfn, map_writable, prefault);
kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);
--
2.21.0
next prev parent reply other threads:[~2019-07-04 9:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-04 9:32 [PATCH 0/5] KVM: some x86 MMU cleanup and new tracepoints Paolo Bonzini
2019-07-04 9:32 ` [PATCH 1/5] kvm: x86: Do not release the page inside mmu_set_spte() Paolo Bonzini
2019-07-04 9:32 ` [PATCH 2/5] KVM: x86: make FNAME(fetch) and __direct_map more similar Paolo Bonzini
2019-07-04 9:32 ` Paolo Bonzini [this message]
2019-07-04 9:32 ` [PATCH 4/5] KVM: x86: change kvm_mmu_page_get_gfn BUG_ON to WARN_ON Paolo Bonzini
2019-07-04 9:32 ` [PATCH 5/5] KVM: x86: add tracepoints around __direct_map and FNAME(fetch) Paolo Bonzini
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